140 lines
8.4 KiB
HTML
140 lines
8.4 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::front_inserter</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_front_inserter skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>front_inserter</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<td>
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<div>定义于头文件 <code><a href="cpp-header-iterator.html"><iterator></a></code></div>
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<td></td>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Container <span class="sy1">></span><br />
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<a href="cpp-iterator-front_insert_iterator.html"><span class="kw661">std::<span class="me2">front_insert_iterator</span></span></a><span class="sy1"><</span>Container<span class="sy1">></span> front_inserter<span class="br0">(</span> Container<span class="sy3">&</span> c <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Container <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <a href="cpp-iterator-front_insert_iterator.html"><span class="kw661">std::<span class="me2">front_insert_iterator</span></span></a><span class="sy1"><</span>Container<span class="sy1">></span> front_inserter<span class="br0">(</span> Container<span class="sy3">&</span> c <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p><code>front_inserter</code> 是为类型从参数类型推导的容器 <code>c</code> 构造 <span class="t-lc"><a href="cpp-iterator-front_insert_iterator.html">std::front_insert_iterator</a></span> 的便利函数模板。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>c</td>
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<td>-</td>
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<td>支持 <code>push_front</code> 操作的容器</td>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>能用于添加元素到容器 <code>c</code> 起始的 <span class="t-lc"><a href="cpp-iterator-front_insert_iterator.html">std::front_insert_iterator</a></span></p>
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<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">可能的实现</span></h3>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Container <span class="sy1">></span>
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<a href="cpp-iterator-front_insert_iterator.html"><span class="kw661">std::<span class="me2">front_insert_iterator</span></span></a><span class="sy1"><</span>Container<span class="sy1">></span> front_inserter<span class="br0">(</span> Container<span class="sy3">&</span> c <span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> <a href="cpp-iterator-front_insert_iterator.html"><span class="kw661">std::<span class="me2">front_insert_iterator</span></span></a><span class="sy1"><</span>Container<span class="sy1">></span><span class="br0">(</span>c<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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</td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <vector></span>
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<span class="co2">#include <deque></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <algorithm></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> v<span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span>, <span class="nu0">5</span><span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-container-deque.html"><span class="kw1270">std::<span class="me2">deque</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> d<span class="sy4">;</span>
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<a href="cpp-algorithm-copy.html"><span class="kw1581">std::<span class="me2">copy</span></span></a><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">front_inserter</span><span class="br0">(</span>d<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy4">:</span> d<span class="br0">)</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> n <span class="sy1"><<</span> <span class="st0">' '</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">5 4 3 2 1</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-front_insert_iterator.html"><span class="t-lines"><span>front_insert_iterator</span></span></a></div>
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</div>
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</td>
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<td>用于在容器头部插入的迭代器适配器<br />
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<span class="t-mark">(类模板)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-back_inserter.html"><span class="t-lines"><span>back_inserter</span></span></a></div>
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</div>
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</td>
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<td>创建拥有从实参推出的类型的 <span class="t-lc"><a href="cpp-iterator-back_insert_iterator.html">std::back_insert_iterator</a></span><br />
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<span class="t-mark">(函数模板)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-inserter.html"><span class="t-lines"><span>inserter</span></span></a></div>
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</div>
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</td>
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<td>创建拥有从实参推出的类型的 <span class="t-lc"><a href="cpp-iterator-insert_iterator.html">std::insert_iterator</a></span><br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</body>
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